Okay, I see these all the time and other than the one chris62 shows, I don't understand what you're gaining with these handles. It still requires you to use your hand, right? What is the benefit of this style of handle?
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Your hand is free to do other things without dropping/clipping the light. In one hand you could run a reel and see where you are going, leaving your other hand free to do things like add air to your BC to keep you from crashing in to the bottom and silting the place out.